37Signals 创始人 Jason Fired 这两天写了几句话：

Some of the most rewarding features to add to products are ones that don’t increase surface area, but increase depth.

This is how you continue to make a product a whole lot better without it feeling like it got a whole lot bigger.

翻译过来，大意是：

加到产品中最有价值的功能，是不增加“表面积”但增加“深度”的功能。